Anchor bolt shield



March 4, 1969 H. T. DEAN ANCHOR BOLT SHIELD Filed April 18, 1967 7 I, 7 5 M, m w .wV

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HULL/E THOMASDEA/V ATTORNEY United States Patent Office 3,430,408 Patented Mar. 4, 1969 3,430,408 ANCHOR BOLT SHIELD Hollie Thomas Dean, 107 N. Artizan St., Williamsport, Md. 21795 Filed Apr. 18, 1967, Ser. No. 631,773 US. Cl. 52-699 1 Int. Cl. E04b 1/56; F16b 37/02 Claim ABSTRACT OF THE DISCLOSURE An anchor bolt shield mounted concentrically around a portion of an anchor bolt by cap members which close the ends of the shield and which resiliently and frictionally grip the anchor bolt to support the shield thereon, spaced at desired distances from the anchor bolt ends while concrete is poured and sets around the shield.

Background of the invention concrete.

Summary It is a primary object of the present invention to provide an anchor bolt shield which is supported concentrically around a portion of an anchor bolt by cap members which close the ends of the shield and which resiliently grip the anchor bolt to retain the shield immovably with respect to the bolt, while concrete is poured therearound and allowed to set, and without risk of the shield moving with respect to the anchor bolt due to vibration of the concrete to remove air pockets and cavities therefrom.

More particularly, it is an object of the invention to provide an anchor bolt shield including corresponding end closure members which will effectively support a sleeve portion of the shield at a desired location relative to the anchor bolt, and which shield portions are so constructed that the assembly thereof on an anchor bolt is greatly facilitated.

Various other objects and advantages of the invention will hereinafter become more fully apparent from the following description of the drawing, illustrating presently preferred embodiments thereof, and wherein:

Brief description of the drawing FIGURE 1 is a vertical sectional view, partly in eleva tion, illustrating a preferred embodiment of the invention;

FIGURE 2 is a cross sectional view, taken substantially along a plane as indicated by the line 2-2 of FIGURE 1, with the concrete omitted;

FIGURE 3 is a cross sectional view taken substantially along a plane as indicated by the line 3-3 of FIGURE 1;

FIGURE 4 is a fragmentary side elevational view of a slightly different embodiment of the invention; and

FIGURE 5 is a cross sectional view thereof, taken substantially along a plane as indicated by the line 55 of FIGURE 4.

Description of the preferred embodiments Referring more specifically to the drawing and first with reference to FIGURES 1 to 3, an anchor bolt designated generally 6 is shown in FIGURE 1 embedded in a portion of a concrete body 7, said anchor bolt having a laterally turned lower end portion 8 for effectively securing it in the concrete 7, and a threaded upper end 9 to receive a nut 10 by which a column or other structure, not shown, can be anchored to the upper surface of the concrete mass 7. The parts previously described are of conventional construction.

The shield designated generally 11, and comprising the invention, includes a sleeve -12 and corresponding closure members or caps 13 and 14 which close the ends of the sleeve 12 and which support the sleeve concentrically around a portion of the anchor bolt 6 and in a desired location between and spaced from the ends thereof.

The sleeve 12 is preferably formed of thin sheet metal having a lock joint or seam 15, which is shown greatly exaggerated in FIGURE 2 for clarity, of the type which is conventional in stove pipes, so that the sleeve 12 can be shipped and handled in a flat condition and assembled around the anchor bolt 6 between the closure members 13 and 14.

Each closure member or cap has a disc-shaped outer wall 16, a narrow inturned annular shoulder 17 which eX- tends inwardly a short distance from the marginal edge of the outer wall 16, and an annular flange 18 which projects from the shoulder 17 in a direction away from the end wall 16 and which is disposed substantially perpendicular to said shoulder 17.

The end wall 16 is provided with a plurality of slits 19 which extend radially from its center and which form a plurality of radially extending prongs 20, each of which tapers toward the center of the cap and terminates in a point 21. The prongs 20 of each cap 13 and 14 are sprung outwardly to provide a central opening in each cap through which the anchor bolt 6 extends, for mounting the caps on the anchor bolt with the inner sides of the caps, from which the flanges 18 project, facing toward one another.

The anchor bolt is suspended in a desired location in a conventional manner and with the caps 13 and 14 applied thereto. The bottom cap 14 can then be adjusted on the anchor bolt 6 to its location of FIGURE 1 and with the upper cap disposed above its position of FIGURE 1. The sleeve 12 can then be applied around the anchor bolt 6 and between the caps 13 and 14 by means of the lock joint 15. The lower end of the sleeve 12 is positioned around the flange 18 of the cap 14 and against the annular shoulder 17, after which the upper cap 13 can be displaced downwardly to position the flange 18 thereof in the upper end of the sleeve and with the shoulder 17 abutting the upper sleeve end. If preferred, both caps can be positioned initially and the sleeve applied around the anchor bolt, by means of its lock joint, and with the sleeve ends engaging the flanges 18 of the two caps and abutting against the shoulders 17. Theprongs 20 having been sprung outwardly to receive the anchor bolt 6 will be spring biased inwardly so that the points 21 thereof will frictionally grip the anchor bolt to retain the shield 11 in a desired position thereon and with the sleeve 12 disposed concentrically around the anchor bolt.

The concrete is then poured up to the level of the upper end of the sleeve 12 which is disposed at the desired level of the surface of the concrete. While the concrete is vibrated to remove air pockets and cavities therefrom, the shield 11 will be effectively maintained in its desired location on the anchor bolt 6, due to the frictional and resilient gripping engagement of the prong points 21 with the anchor bolt. The caps 13 and 14 are preferably formed of light sheet metal, such as mild carbon sheet steel. After the concrete is set the upper cap 13 may be removed from the sleeve 12, if so desired, and said sleeve then filled with grout or cement, not shown, after the upper part of the anchor bolt has been adjusted to any extent necessary to bring it into a correct position.

FIGURES 4 and 5 illustrate a slightly modified form of anchor bolt shield, designated generally 22, composed of a sleeve 23, corresponding to the sleeve 12, and corre-' sponding end caps or closures 24 and 25, which differ from the closures 13 and 14, and each of which includes an end wall 26 and annular flange 27 which fits telescopically over an end of the sleeve 23. Each end wall 26 has radial slits 28 forming tapered prongs 29 which correspond with the prongs 20 and which function in the same manner in conjunction with an anchor bolt 30. The anchor bolt 30 differs from the anchor bolt 6 in that a square anchor plate 31 replaces the bolt portion 8 and is secured to the lower end of the anchor bolt and crosswise thereof. After the concrete, not shown in FIGURE 4, has set around the sleeve 23 to the level of its upper end, the top 26 of cap 24 can be cut out for filling the sleeve 23 with grout.

It will also be readily apparent that the resilient prongs and 29 enable the end caps 13, 14 and 24, to be utilized with anchor bolts of difierent diameters.

Various other modifications and changes are contemplated and may obviously be resorted to, without departing from the function or scope of the invention.

I claim as my invention:

1. In combination with an anchor bolt having a laterally extending end adapted to be embedded in concrete and having a threaded end, a shield supported by said anchor bolt including a generally cylindrical metal sleeve surrounding a part of the anchor bolt and a pair of corresponding closure members engaging the ends of the sleeve and the anchor bolt andsupporting the sleeve concentri- References Cited UNITED STATES PATENTS 721,114 2/1903 West 285424 1,645,903 10/1927 Garber 52-708 2,039,886 5/1936 Cohn 285424 2,264,480 12/1941 Owen -36 2,781,658 2/1957 Dobell 8536 3,036,793 5/1962 Becker 8536 3,325,198 6/1967 Cruse 85-36 EDWARD C. ALLEN, Primary Examiner.

US. Cl. X.R. 85-36 

